[单选题]关于热水供暖系统的循环水泵,说法正确的是哪一项?( )

A、扬程为系统各个管段阻力之和
B、水泵一般安装在回水管上
C、水泵一般安装在供水管上
D、流量为最不利管段的流量之和

参考答案： B

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